This is what I got from just plugging the quote into a browser. It’s all over the place on the web and attributed to him at this speech. Whether or not he actually said it I don’t know.
http://www.zoominfo.com/p/Chester-Pierce/4293036
www.freeworldalliance.com , 24 May 2002 [cached]
April 1972 - In his keynote address to the Association for Childhood Education International, Chester M. Pierce, Professor of Education and Psychiatry in the Faculty of Medicine at Harvard University, proclaims: “Every child in America entering school at the age of five is insane because he comes to school with certain allegiances toward our founding fathers, toward his parents, toward a belief in a supernatural being....
See post 50.